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          Mokee 与 aosp 工程文件的分析
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            <div class="post-description">aosp支持的机型还是比较少，mokee 是基于LineageOS 的国内汉化版，支持更多的机型，本文开始研究mokee, 首先还是弄清楚每个文件夹的作用。</div>

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        <p>通过文件夹对比, 了解整个工程结构, aosp的开发流程, mokee系统做了哪些事情</p>
<ul>
<li>mokee nexus 5x:</li>
</ul>
<p>android     bootable        compatibility  development  frameworks  libnativehelper  packages          prebuilts  test<br>Android.bp  bootstrap.bash  cts            device       hardware    Makefile         pdk               sdk        toolchain<br>art         build           dalvik         doc          kernel      mokee-sdk        platform_testing  syntax     tools<br>bionic                      developers     external     libcore     out              plugin            system     vendor</p>
<ul>
<li>aosp sargo:</li>
</ul>
<p>Android.bp   bootable        developers                       frameworks       Makefile          projectFilesBackup   tools<br>             bootstrap.bash  development                      gen              out               projectFilesBackup1  vendor<br>             build           device                           hardware         packages          sdk<br>             compatibility   external                         kernel           pdk               system<br>art          cts             extract-google_devices-sargo.sh  libcore          platform_testing  test<br>bionic       dalvik          extract-qcom-sargo.sh            libnativehelper  prebuilts         toolchain</p>
<ul>
<li>不同之处:</li>
</ul>
<p>android :</p>
<pre><code>default.xml, snippets/mokee.xml 记录的是整个工程的应用路径,名称,分组

分组有 pdk, aosp, tools, nopresubmit, vts, darwin, pdk-fs, pdk-cw-fs...  

应用文件包有 packages, frameworks, prebuilts, pdk, external, art, bionic, cts, dalvik, bootable, device, developers, development, hardware, system, test, tools, mokee-sdk, vendor, 
基本上每个文件夹下都是应用

这些配置文件是在什么时候加载的呢? 

pdk, bionic, cts 代表啥</code></pre><p>gen:<br>    aosp 编译完生成的 aidl 文件</p>
<p>mokee-sdk:<br>    mokee 额外开发的, 涉及的内容还是挺多的 </p>
<ul>
<li>相同之处:</li>
</ul>
<p>android.bp:<br>    <a href="http://gityuan.com/2018/06/02/android-bp/" target="_blank" rel="noopener">android最新的编译系统</a></p>
<pre><code>用来替代android.mk, 纯粹的配置, 没有分支, 循环等流程控制, 不能做算数逻辑运算, 如果需要控制逻辑, 只能使用go语言写
Ninja, 是一个编译框架, 一般不会手动修改, 是由android.bp 转换成ninja格式来编译
Soong, 类似于Makefile编译系统的核心, 负责Android.bp语义解析, 并将之转换成ninja文件
Blueprint, 生成, 解析Android.bp的工具, 是Soong的一部分,是由golang写的项目, android7.0以后, prebuilts/go 为golang的运行环境
kati, 专为Android开发的一个基于golang 和 C++ 的工具, 主要是将 Android.mk 转换成ninja 文件, 代码路径是 build/kati, 编译后的产物是kati</code></pre><p>art:<br>    art 虚拟机</p>
<p>bionic:<br>    由google 开发的c标准库, 用于android嵌入系统上, 用来取代glibc, 不依赖于BSD kernel, 但是由BSD 授权条款运行于linux上</p>
<p>bootable:<br>    recovery, recovery-twrp</p>
<p>bootstrap.bash:<br>    环境变量配置脚本</p>
<p>build:<br>    编译工具合集, blueprint, kati, soong, make</p>
<p>compatibility:<br>    cdd(Compatibility Definition Document) 文档, 每一个版本都会有一个cdd, 代表Android 兼容性的”政策”方向</p>
<p>cts:<br>    兼容性测试套件, 是一个自动化测试工具, 免费的商业级测试, CTS 验证程序是手动测试工具,对CTS的补充<br>    签名测试, 平台API测试, Dalvik测试, 平台数据测试, 平台Intent, 平台权限, 平台资源</p>
<p>dalvik:<br>    虚拟机, 为何与art同时存在? dalvik 支持JIT, 但是会拖慢系统速度, 现已被 ART 虚拟机取代. 但是为了兼容, 所以两者目前都可以用, 可以选择. ART, 安装慢点, Dalvik 运行慢, 所以要看取舍. </p>
<p>developers:<br>    提供给开发者的一些demos, samples</p>
<p>development:<br>    系统自带的一些测试应用, 工具, 模板</p>
<p>device:<br>    对应不同芯片编译的一些Android.mk 文件, 基本上每个模块也都有readme, 在哪里, 什么时机用到呢?</p>
<p>external:<br>    外部依赖库的位置</p>
<p>frameworks:<br>    基于系统服务层与应用层之间, 用于提供给应用层sdk? 按已有的经验基本上看到的源码就是在framework 层</p>
<p>hardware:<br>    硬件层, 有的只是提供头文件, 没有源码, 就那是动态链接库了<br>    Camera, 蓝牙, Audio, Graphics… </p>
<p>kernel:<br>    在mokee 中直接有源码, 在aosp 中只是配置文件<br>    kernel 层已经包含了驱动, 各vendor 硬件一般只需要实现 HAL 层即可</p>
<p>libcore:<br>    核心库, json, art, dalvik, benchmarks</p>
<p>libnativehelper:<br>    看名知意, 本地库工具库</p>
<p>out:<br>    编译完输出目录</p>
<p>packages:<br>    系统应用工程目录</p>
<p>pdk:<br>    platform development kit<br>    帮助芯片商, OEM 移植新的发布版本, 包含了开发android HAL的必要组件<br>    这里mokee 与 aosp 是一样的</p>
<p>platform_testing:<br>    全平台的测试, 与多个android services 交互, 或者 HAL layers, Instrumentation Test, Native Test, CTS</p>
<p>prebuilts:<br>    编译脚本的运行环境</p>
<p>sdk:<br>    这个sdk, 与framework 又有何区别?<br>    一些sdk tools 移到了 tool/base, tool/swt<br>    sdk manager, ddms, avd manager 这些项目工程</p>
<p>system:<br>    操作系统源代码</p>
<pre><code>初步理解是与 kernel, art, HAL, 打交道, 初始化虚拟机, 编写基于 binder, jni, wifi, bluetooth, 这些硬件的功能, 然后通过jni, 提供framework 层, 使用java调用.
java调用硬件的能力, 都在system 这里已经使用c++实现了, 通过jni调用</code></pre><p>test:<br>    vts 测试框架</p>
<p>toolchain:<br>    开发使用的工具链, GNU的编译器, 链接器, 汇编器等等 </p>
<p>tools:<br>    各种第三方的工具, apk sign, app bundle, app zip, fat32, gradle, log analysis.</p>
<p>vendor:<br>    各手机厂商(包括第三方的开源组织)定制的内容<br>    mokee 中有预置的apk, 针对Telephony, Camera 定制的cpp<br>    aosp 中直接就是qcom 的 *.so</p>

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